WTPA31 PHFO 261452 TCPCP1 BULLETIN TROPICAL STORM NIALA ADVISORY NUMBER 7 NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI CP062015 500 AM HST SAT SEP 26 2015 ...NIALA STRENGTHENS A LITTLE AND CONTINUES MOVING NORTHWEST CLOSER TO HAWAII... SUMMARY OF 500 AM HST...1500 UTC...INFORMATION ---------------------------------------------- LOCATION...17.3N 151.7W ABOUT 280 MI...445 KM SE OF HILO HAWAII ABOUT 490 MI...785 KM ESE OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...NW OR 315 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...997 MB...29.44 INCHES WATCHES AND WARNINGS -------------------- CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * HAWAII COUNTY A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS OF THE INITIAL ISSUANCE. INTERESTS ELSEWHERE IN THE MAIN HAWAIIAN ISLANDS SHOULD MONITOR THE PROGRESS OF TROPICAL STORM NIALA. FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN HONOLULU HAWAII. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ AT 500 AM HST...1500 UTC...THE CENTER OF TROPICAL STORM NIALA WAS LOCATED NEAR LATITUDE 17.3 NORTH...LONGITUDE 151.7 WEST. NIALA IS MOVING TOWARD THE NORTHWEST NEAR 7 MPH...11 KM/H. A TURN TOWARD THE WEST AND A SLOWING OF THE FORWARD MOTION IS EXPECTED TO OCCUR THIS WEEKEND. ON THE FORECAST TRACK...THE CENTER OF NIALA WILL PASS 100 TO 150 MILES SOUTH OF THE BIG ISLAND SUNDAY NIGHT. MAXIMUM SUSTAINED WINDS ARE NEAR 60 MPH...95 KM/H...WITH HIGHER GUSTS. SLOW WEAKENING IS EXPECTED OVER THE NEXT COUPLE OF DAYS. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 90 MILES...150 KM FROM THE CENTER. REMEMBER THAT DAMAGING EFFECTS FROM TROPICAL CYCLONES CAN EXTEND WELL AWAY FROM THE CENTER. THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 997 MB...29.44 INCHES. HAZARDS AFFECTING LAND ---------------------- RAINFALL...STORM TOTAL RAINFALL OF 6 TO 12 INCHES...WITH ISOLATED MAXIMUM AMOUNTS TO 16 INCHES...ARE EXPECTED WITHIN THE WATCH AREA. THESE RAINFALL AMOUNTS COULD CAUSE LIFE-THREATENING FLASH FLOODS...AS WELL AS ROCKSLIDES AND MUDSLIDES. SURF...SWELLS ASSOCIATED WITH TROPICAL STORM NIALA WILL PRODUCE LARGE SURF ALONG SOUTHEAST FACING SHORES OF MAINLY THE BIG ISLAND THIS WEEKEND AND CONTINUING INTO EARLY NEXT WEEK. WIND...TROPICAL STORM CONDITIONS ARE POSSIBLE ON THE BIG ISLAND ON SUNDAY. NEXT ADVISORY ------------- NEXT INTERMEDIATE ADVISORY...800 AM HST. NEXT COMPLETE ADVISORY...1100 AM HST. $$ FORECASTER R BALLARD